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    <h2 id="pkg-overview">package subtle</h2>
    <p><code>import "crypto/subtle"</code>
    <p>Package subtle implements functions that are often useful in cryptographic
        code but require careful thought to use correctly.</p>
    <h3 id="pkg-index" class="section-header">Index <a class="permalink" href="#pkg-index">&para;</a></h3>
    <a href="../main.html"><h3>返回首页</h3></a>
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        <li><a href="#ConstantTimeByteEq">func ConstantTimeByteEq(x, y uint8) int</a></li>
        <li><a href="#ConstantTimeEq">func ConstantTimeEq(x, y int32) int</a></li>
        <li><a href="#ConstantTimeLessOrEq">func ConstantTimeLessOrEq(x, y int) int</a></li>
        <li><a href="#ConstantTimeCompare">func ConstantTimeCompare(x, y []byte) int</a></li>
        <li><a href="#ConstantTimeCopy">func ConstantTimeCopy(v int, x, y []byte)</a></li>
        <li><a href="#ConstantTimeSelect">func ConstantTimeSelect(v, x, y int) int</a></li>
    </ul>
    <h3 id="ConstantTimeByteEq">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#31">ConstantTimeByteEq</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeByteEq(x, y <a href="builtin.htm#uint8">uint8</a>) <a href="builtin.htm#int">int</a></pre>
    <p>如果x == y返回1，否则返回0。</p>
    <h3 id="ConstantTimeEq">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#41">ConstantTimeEq</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeEq(x, y <a href="builtin.htm#int32">int32</a>) <a href="builtin.htm#int">int</a></pre>
    <p>如果x == y返回1，否则返回0。</p>
    <h3 id="ConstantTimeLessOrEq">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#70">ConstantTimeLessOrEq</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeLessOrEq(x, y <a href="builtin.htm#int">int</a>) <a href="builtin.htm#int">int</a></pre>
    <p>如果x &lt;= y返回1，否则返回0；如果x或y为负数，或者大于2**31-1，函数行为是未定义的。</p>
    <h3 id="ConstantTimeCompare">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#12">ConstantTimeCompare</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeCompare(x, y []<a href="builtin.htm#byte">byte</a>) <a href="builtin.htm#int">int</a></pre>
    <p>如果x、y的长度和内容都相同返回1；否则返回0。消耗的时间正比于切片长度而与内容无关。</p>
    <h3 id="ConstantTimeCopy">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#55">ConstantTimeCopy</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeCopy(v <a href="builtin.htm#int">int</a>, x, y []<a href="builtin.htm#byte">byte</a>)</pre>
    <p>如果v == 1,则将y的内容拷贝到x；如果v == 0，x不作修改；其他情况的行为是未定义并应避免的。</p>
    <h3 id="ConstantTimeSelect">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/subtle/constant_time.go?name=release#28">ConstantTimeSelect</a> <a class="permalink" href="#pkg-index">&para;</a></h3>
    <pre class="funcdecl">func ConstantTimeSelect(v, x, y <a href="builtin.htm#int">int</a>) <a href="builtin.htm#int">int</a></pre>
    <p>如果v == 1，返回x；如果v == 0，返回y；其他情况的行为是未定义并应避免的。</p>
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